added update function for penv, to impl for jconf

penv

@@ -5,9 +5,11 @@
 # MIT Licensed, by The Grammer Society
 
 # Issues:
-# names are fully lower case when installed as jupyterhub spec. convert name to lower case when deleting an env.
 # when uninstalling, remove any jupyter specs. iterate through envs in .env, call jspec remove name.
 
+VERSION=1
+
+
 usage() {
     echo ""
     echo "Usage: penv <command> <args>"
@@ -21,6 +23,7 @@ usage() {
     echo " - list                     - List available environments"
     echo " - pylist                   - List available PYTHON versions"
     echo " - install                  - Initialize user's profile"
+    echo " - update                   - Update penv to latest version"
     echo " - uninstall                - Remove ALL the environments installed using PENV"
     echo " - help                     - Print this message"
     echo
@@ -31,6 +34,7 @@ usage() {
     echo " - activate -> ac, act"
     echo " - pylist   -> pyls"
     echo " - list     -> ls"
+    echo " - update   -> up"
 }
 
 title(){
@@ -163,6 +167,7 @@ install() {
     " > "$HOME"/.envs/.penv.funcs
     add2RC bashrc
     add2RC zshrc
+    chmod +x "$HOME/.local/bin/penv"
     echo "Initialized PENV. Restart the shell"
 }
 
@@ -203,6 +208,27 @@ pyls(){
     find /usr/local/bin /usr/bin -name "python3.*" 2> /dev/null | tr " " "\n" | grep "3.*" --color=always
 }
 
+update(){
+    if [[ $(realpath "$0") != "$HOME/.local/bin/penv" ]]; then
+        echo PENV not installed yet. Install it to use the update command.
+        exit 12
+    fi
+
+    if [ -x "$(command -v curl)" ]; then
+        curl "https://git.pvnweb.dedyn.io/phanipavank/jbomb/raw/branch/master/penv" -o "$HOME/.local/bin/penv"
+    elif [ -x "$(command -v wget)" ]; then
+        wget -o "$HOME/.local/bin/penv" "https://git.pvnweb.dedyn.io/phanipavank/jbomb/raw/branch/master/penv"
+    else
+        echo Curl or wget not found. Install either one to update penv.
+    fi
+    chmod +x "$HOME/.local/bin/penv"
+    sleep 0.5
+    newVer=$(grep VERSION "$HOME/.local/bin/penv" | cut -d '=' -f 2)
+    echo "PENV updated from $VERSION to $newVer"
+    exit 0
+}
+
+
 if [ "$#" -lt 1 ]; then
     title
     usage
@@ -240,6 +266,9 @@ case "$cmd" in
     uninstall)
         uninstall
         ;;
+    update|up)
+        update
+        ;;
     *)
         echo "invalid command: \"$1\"" >&2
         echo "$SCRIPT"